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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

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Environmental fate & pathways

Phototransformation in air

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phototransformation in air
Type of information:
Adequacy of study:
key study
Study period:
20 Feb 2012
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
results derived from a valid (Q)SAR model and falling into its applicability domain, with adequate and reliable documentation / justification
Justification for type of information:
QSAR prediction: migrated from IUCLID 5.6
Principles of method if other than guideline:
Calculation based on AOPWIN v1.92, Estimation Programs Interface Suite™ for Microsoft® Windows v 4.10. US EPA, United States Environmental Protection Agency, Washington, DC, USA.
GLP compliance:
Estimation method (if used):
- Concentration of OH radicals: 0.5E+06 radicals/cm3
- Degradation rate constant: 30.6378 E-12 cm3/molecule-sec
- Temperature for which rate constant was calculated: 25 °C
- Computer programme: AOPWIN v1.92
12.568 h
Test condition:
calculation based on a 24 h day

For detailed describtion on the model and its applicability, see "Any other information on materials and methods incl. tables". The estimation is based on a 24 hour day.

Description of key information

T1/2 = 12.6 h (sensitizer: OH radical) (AOP Win v1.86)

Key value for chemical safety assessment

Half-life in air:
12.6 h
Degradation rate constant with OH radicals:
30.638 cm³ molecule-1 s-1

Additional information

No studies investigating the indirect photolysis of AEPD are available. Using AOP Program (v1.92), a half-life of 12.6 hours was calculated, indicating rapid degradation by indirect photolysis.